6901228561 has 2 divisors, whose sum is σ = 6901228562. Its totient is φ = 6901228560.

The previous prime is 6901228553. The next prime is 6901228589. The reversal of 6901228561 is 1658221096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5530748161 + 1370480400 = 74369^2 + 37020^2 .

It is a cyclic number.

It is not a de Polignac number, because 6901228561 - 2³ = 6901228553 is a prime.

It is not a weakly prime, because it can be changed into another prime (6901228511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3450614280 + 3450614281.

It is an arithmetic number, because the mean of its divisors is an integer number (3450614281).

Almost surely, 2^6901228561 is an apocalyptic number.

It is an amenable number.

6901228561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6901228561 is an equidigital number, since it uses as much as digits as its factorization.

6901228561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 6901228561 is about 83073.6333682354. The cubic root of 6901228561 is about 1903.8912459692.

The spelling of 6901228561 in words is "six billion, nine hundred one million, two hundred twenty-eight thousand, five hundred sixty-one".